huangyhg

settlement joint
we have building with dimension 300 meter x100 meter the building has basement for whole area and 4 floor above basement on 50% of that area , remain part has 1 floor only above basement
i want to ask if we need settlement joint between the part with 4 floor and the remain part or not
foundation type is raft
regards

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swelm, you'll definetly have differential settlement. an isolation joint would be a good idea.
but if i want to cancell this joint arch matter
is that possible or not?
this is not an architexctural matter. i would definitely provide a structural joint and the architecture will need to provide movement joints also.
i agree with jike, you'll need to provide a joint and inform the architect to do likewise.
if the dead load pressures are equal on both sides of building, then differential settlement will be minimized. the lack of joint would require some foundation stiffness to transfer shears and moments across the change of height if some settlement occurs. the amount of stiffness required would be the same across any abitrary plane separating two portions of the building.
thanks for all reply but we have skylight between the two parts of the building so i cannot make joint at skylight support
the skylight is heavy steel structural

i would simply ask the geotech engineer for the differential settlement between the two sides.
300 m seems like a very long building to not have an expansion joint in it somewhere just to deal with the expansion/contraction associated with temperature gradient both during construction and permanent conditions.
i aleardy put more than 2 expansion joint but this joint not in raft
i will ask geotech about his recommendation
thanks all

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